PreferencesPath is a global option that specifies which directories are searched for user-specific settings when Mathematica is started.
Prefix
(Built-in Mathematica Symbol) Prefix[f[expr]] prints with f[expr] given in default prefix form: f@expr. Prefix[f[expr], h] prints as hexpr.
++x increases the value of x by 1, returning the new value of x.
Prepend
(Built-in Mathematica Symbol) Prepend[expr, elem] gives expr with elem prepended.
PrependTo[s, elem] prepends elem to the value of s, and resets s to the result.
PreserveImageOptions is an option to graphics and related functions that specifies whether image size and certain other options should be preserved from the previous version ...
PriceGraphDistribution[n, k, a] represents a de Solla Price graph distribution for n-vertex graphs where a new vertex with k edges is added at each step using attractiveness ...
Prime
(Built-in Mathematica Symbol) Prime[n] gives the n\[Null]^th prime number.
PrimeNu
(Built-in Mathematica Symbol) PrimeNu[n] gives the number of distinct primes \[Nu](n) in n.
PrimeOmega[n] gives the number of prime factors counting multiplicities \[CapitalOmega](n) in n.